one more question :)

[japanjapan]

Dear teachers,
please read the following paragraph.
At Gate 13, the arrivals are just coming in. "I see her. There she is." Just as poignant, the arrivals fold into the mix of people as if they have been the missing ingredient. There are tears and smiles, pure delight.

What's the meaning of the colored part?
Is "poignant" adjective or noun?
what's the meaning?

Thanks a lot.

[Tdol]

It's an adjective meaning moving/emotional.